Weird box on screen

I have had this phone for about a week now and I suddenly saw like a box on the screen when in Snapchat. Like a perfect chaped box. I looked around and saw that this box existed systemwide. So I tried a restart, but it's still there, it's as if the middle of my screen (inside the box) is darker than below and above. It's running MIUI 11 (Android 9)

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Hi,

I currently own a Mi Note 10 and would be happy to assist you with your problem. If you’d be able to attach a picture of what the screen looks like (when the box is visible that’d be great).

Best wishes, Sam

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Unfortunally it's nothing I can screenshot and send

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Do you have any other camera you'd be able to take a picture of the screen itself with?

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